CN107703444A - A kind of acquisition methods of magnetic latching relay surge current safety curve - Google Patents
A kind of acquisition methods of magnetic latching relay surge current safety curve Download PDFInfo
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- CN107703444A CN107703444A CN201710804846.4A CN201710804846A CN107703444A CN 107703444 A CN107703444 A CN 107703444A CN 201710804846 A CN201710804846 A CN 201710804846A CN 107703444 A CN107703444 A CN 107703444A
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- relay
- surge current
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- current
- safety curve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a kind of acquisition methods suitable for magnetic latching relay surge current safety curve, choose different surge current peak Is and surge duration t, experiment obtains the surge current trouble free service point under the different surge duration for specifying relay, with reference to relay surge current safety curve model, the special surge current safety curve of the acquisition specified relay.Compared with conventional relay safety curve, the inventive method considers influence of the contact electric arc surge current to contact melted, and test result curve more conforms to the actual working state of relay.Meanwhile the surge current safety curve obtained after tested is applied to the circuit of surge current be present, can effectively instruct the safe handling of relay.
Description
Technical field
The invention belongs to space technology field, is related to a kind of acquisition side of magnetic latching relay surge current safety curve
Method.
Background technology
Magnetic latching relay is widely used in satellite power supply and distribution subsystem, and its major function is to control power supply to connect on and off
Open.The power supply safety that the safe and reliable property of relay is related to whole star using connecing, or even the success or failure of whole star task.Due to equipment
Manufacturer designs for EMC to be considered, in equipment input larger filter capacitor in parallel, causes device power-on moment to produce larger
Electric capacity charging surge current and caused by relay contact adhesion damage fault, at present the country repeatedly there is magnetic latching relay
The problem of contact melted adhesion.Through failure analysis, the relay for confirming contact adhesion occur is due to that electrical over-stress causes to touch
Point occurs transient state arc erosion and contact melted failure occurs.
Contact fault rate accounts for more than the 90% of whole relay fault rate.Wherein, melting welding failure is that relay is the tightest
One of failure of weight.Due to equipment input larger filter capacitor in parallel, relay contact closure moment can produce transient state wave
Electric current is gushed, causes relay contact to be damaged even adhesion.The relay for adhesion occur is due to that electrical over-stress causes contact
Generation transient state arc erosion and the failure that sticks together.Research shows that the adhesion of relay contact had both been likely to occur in contact closure mistake
Journey, it is also possible to contact breaking course occurs, referring to (Jiang Dongsheng, Zhang Pei, Liu Xin army the aerospace relay wave functions of current of document 1
Lower electrical contact life search Spacecraft Environment Engineerings, the N0.6 of volume 30,2013).
The load of filter-capacitor circuit is housed for input, such as Fig. 1, the surge current as caused by charging electric capacity is to cause
The principal element of contact closure adhesion fault.Relay these electric capacity of closure moment need input current to charge it until stable state
Voltage, this charging current are surge current.Fig. 2 illustrates a typical surge current waveform.It has two spikes.First
Individual inrush current spike caused by being filter capacitor；This peak value is by injection filter capacitor and the electric current of the input end capacitor of load
Form, it is to electric capacity charging until capacitance voltage reaches steady-state value.Second current peak is that production is overshooted when load voltage is established
Raw.
Solving such surge current generally has two kinds to the method that relay contact damages, and one kind is increase Surge suppression hand
Section, including the surge restraint circuit or current-limiting resistance formed using MOSFET element, referring to document 2 (Jiang Dongsheng, Zhang Yi, Liu Xin
Army space flight magnetic latching relay contact adhesion fault Analysis on Mechanism and protection technique research.Spacecraft Environment Engineering, volume 30
N0.6,2016)；But this solution can cause complicated circuitry, reliability reduction, quality and cost increase.
Another solution is to increase surge current safety line index to relay, true i.e. by design initial stage in design
Surge current energy caused by protecting circuitry is less than relay surge current safety line, it is ensured that relay will not be caused to damage
Wound.For the program for optimizing the use conditions of Surge suppression means, the safety in utilization for improving relay is significant.But
It is that the conventional safety curve of relay is only applicable to steady state working voltage and current condition, for the circuit of surge current be present not
It is applicable.Therefore, the emphasis that a rational relay surge current safety curve is the present invention how is obtained.
The content of the invention
In view of this, can the invention provides a kind of acquisition methods of magnetic latching relay surge current safety curve
Suitable for the circuit of surge current be present, with reference to the point of safes of relay, the Special safety for obtaining particular relay uses curve
Parameter, instruct the engineering of relay to use, can effectively reduce the generation of relay contact melting welding failure.
In order to solve the above-mentioned technical problem, the present invention is realized in：
A kind of acquisition methods suitable for magnetic latching relay surge current safety curve, it is characterised in that choose different
Surge current peak I and surge duration t, experiment obtain specify relay the different surge duration under surge electricity
Trouble free service point is flowed, with reference to relay surge current safety curve model, the special surge current of the acquisition specified relay
Safety curve.
Preferably, choose different surge current peak Is and surge duration t is：According to specified relay contact
Rated current Irate, overstress COEFFICIENT K=2,3 ... is chosen, m, m are the overstress coefficient maximum chosen, then setting experiment institute
Surge current peak point current is KIrate；According to the closure shaky time T of specified relaysSelected surge current pulse width
Parameter is surge duration t=Ts/ N, N=1,2 ..., n, n are setting value.
Preferably, m=6, n=5.
Preferably, the experiment obtains the surge current trouble free service point under the different surge duration for specifying relay
For：One group of I and t forms a pair of test parameters, and order is applied to the test parameters change on specified relay, for every a pair of experiments
Parameter, carry out relay contact closure, the cyclic test disconnected；In the closure test number (TN) of design, if contact does not occur
Welding Phenomena, then current test parameter is surge current trouble free service point.
Preferably, the combination relay surge current safety curve model, the special wave of the specified relay is obtained
Gushing electric current safety curve is：From the surge current trouble free service point obtained, surge corresponding to same surge duration t is chosen
Current peak maximum Imax, by all (t, the I of selectionmax) it is used as fitting data point；Pacified using the relay surge current
Full curve model is fitted, and obtains model parameter, you can obtains specifying the special surge current safety curve of relay.
Preferably, the safety curve model uses the exponential curve of arc current：kI2t；Wherein, k be for specify after
Electrical equipment model parameter undetermined.
Preferably, it is described to make the test parameters being applied on specified relay change turn to：Used in the load end of relay
Resistance-capacitance network, which matches, realizes the generation of surge current pulse, by regulation resistance, capacitance surge current peak I and
Surge duration t changes.
Preferably, the resistance-capacitance network includes current-limiting resistance R0, ballast resistance R1, load capacitance C and capacitor equivalent string
Join resistance rc；Load capacitance C and capacitor equivalent series resistance rcAfter series connection with ballast resistance R1Parallel connection, the connection of parallel circuit one end
Supply voltage V positive pole, other end series limiting resistor R0With the contact K of specified relaycSupply voltage V negative pole is connected afterwards；
By adjusting current stabilization electricity R1With load capacitance C size, order is applied to the test parameters change on specified relay.
Beneficial effect：
(1) steady state working voltage and current condition often are only applicable to safety curve the present invention overcomes relay,
The surge current safety curve obtained through experiment is applied to the circuit of surge current be present, can effectively instruct the peace of relay
It is complete to use.
(2) electric current loaded relative to tradition using twice of relay contact rated current square wave to relay contact
Overload test method, the state of actual circuit can be more accurately simulated, the actual safe handling to relay more has guidance to anticipate
Justice.
(3) the inventive method considers two stress factors of surge current peak value and surge current duration and contact is melted
The influence of adhesion is welded, result of the test curve more conforms to the actual working state of relay.
(4) test matrix table design experiment parameter is used in test process, test sample covering relay is effectively ensured
Contact melted condition, exclude the influence brought due to experimental design unreasonable factor to result of the test.
Brief description of the drawings
Fig. 1 is device power supply (DPS) input interface filter circuit；
Fig. 2 is typical surge current waveform and surge current peak value and duration；
Fig. 3 is relay safety curve tester for testing figure；
Fig. 4 is that experiment obtains the relay safety curve that data are drawn；
Fig. 5 is flow chart of the present invention.
Embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The invention provides a kind of acquisition methods of magnetic latching relay surge current safety curve, its basic thought is,
Different surge current peak Is and surge duration t are chosen, experiment was obtained under the different surge duration for specifying relay
Surge current trouble free service point, with reference to relay surge current safety curve model, obtain the special of the specified relay
Surge current safety curve.
Compared with conventional relay safety curve, the inventive method considers contact electric arc surge current to contact melted
Influence, utilize the two stress factors experiment of surge current peak value and duration to obtain the different surge duration of relay
Under surge current trouble free service point, with reference to the point of safes of relay, the Special safety for obtaining particular relay is joined using curve
Number, test result curve more conform to the actual working state of relay.Meanwhile the surge current safety curve obtained after tested
Suitable for the circuit of surge current be present, can effectively instruct the safe handling of relay, relay contact melting welding event is reduced
The generation of barrier.
This method includes three main aspects：Relay surge current safety curve model is selected, relay surge current
Damage and life experiment test, the fitting test of relay surge current safety curve.
It is described in detail with reference to implementations of the Fig. 5 to whole scheme.
First, to selected being analyzed as follows of relay surge current safety curve pattern function：
1) the melting welding pattern of split-phase relay contact, during contact closure, prebreakdown electric arc during due to closure or touch
The dynamic and static contact face metal melting of arc energy that is formed during head spring and form melting welding.
2) melting welding of split-phase relay contact causes reason, influences the factor of melting welding, mainly there is characteristic of bouncing, contact pole
Property, material character, arc energy, electrical arcing.The relay of sizing, arc energy are the principal elements of influencing contactor adhesion.
3) analysis calculates the arc energy E of relay closure moment input contact surface：
In formula：E-arc energy；
I-peak arc current；
R-contact resistance；
Ta-arc duration；
T-time；
4) the arc energy equation of moment input contact surface is closed according to relay it was determined that relay contact melts
Weldering failure is related to the square value size of arc current, and surge current safety curve selects the exponential expression of arc current：
k(I)2t
In formula：T-it is the surge current duration；
K-it is coefficient, and the present invention is for specifying relay model parameter undetermined.
Then, the damage of relay surge current and life experiment test are carried out as follows：
1) choosing influences the key circuit parameters of relay contact melting welding：Choose different contact surge current peak Is and
Two stress factors of surge duration, formulate test matrix.
According to the rated current I of relay contactrate, overstress COEFFICIENT K=2,3 ... 5, m is chosen, m is that the mistake chosen should
Force coefficient maximum, here m=6；Experiment surge peak point current is set as KIrate.Shaky time T is closed according to relaysIt is selected
Surge current pulse width parameter is surge duration t=Ts/ N, N=1,2 ... n.N is setting value, and n is bigger, the duration
Division is finer and closely woven.
Formulate following test matrix table 1：
Table 1
2) hardware circuit for applying two stress factors to relay is built.
In order to make the test parameters being applied on specified relay change, the present invention uses resistance in the load end of relay
Capacitance network matches the generation for realizing surge current pulse, while ensures surge peak value electricity by regulation resistance, the parameter of electric capacity
Stream I, surge duration t meet the requirement of each testing site of test matrix.
Test schematic can be built according to Fig. 3, K in Fig. 3cFor tested relay power contact, R0For current-limiting resistance,
R1For ballast resistance, C is load capacitance, rcFor capacitor equivalent series resistance；R1、C、R0、rcContact arc voltage divider is formed,
V is supply voltage.Load capacitance C and capacitor equivalent series resistance rcAfter series connection with ballast resistance R1Parallel connection, parallel circuit one end connect
Meet the positive pole of supply voltage, other end series limiting resistor R0With the negative pole that supply voltage is connected behind the contact of specified relay；
Adjust R1With C size, in relay contact KcThe surge current under different surge conditions will be produced during closure, in loop.
Surge current peak value：IPeak=V/ (rc+R0)
Surge time：
3) a pair of test parameters are formed according to the test matrix table 1 of above-mentioned foundation, one group of I and t, for every a pair of experiment ginsengs
Number, carry out relay contact closure, the cyclic test disconnected.
4) in design closure test number (TN), in the event of contact melted phenomenon, then it represents that melting welding failure occur, current examination
Parameter is tested to outside safety curve envelope scope；Show that current test parameter is in safety curve bag by experiment if not occurring
It is surge current trouble free service point in the range of network.
Finally, obtained with reference to relay surge current safety curve model, relay surge current safety curve by such as
Lower step is carried out：
1) from the surge current trouble free service point obtained, safety curve fitting data point is chosen, selection principle is：Each
Surge current pulse width parameter (i.e. t) under corresponding surge current peak value the maximum Imax；By all (t, the I of selectionmax) make
For fitting data point.
2) relay surge current safety curve model k (I) is utilized2T is fitted to fitting data point, obtains mould
Shape parameter k, you can obtain the special contact surge current safety curve of the relay.
In summary, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
Claims (8)
1. a kind of acquisition methods suitable for magnetic latching relay surge current safety curve, it is characterised in that choose different
Surge current peak I and surge duration t, experiment obtain the surge current under the different surge duration for specifying relay
Trouble free service point, with reference to relay surge current safety curve model, the special surge current for obtaining the specified relay is pacified
Full curve.
2. the method as described in claim 1, it is characterised in that choose different surge current peak Is and surge duration t
For：According to the rated current I of specified relay contactrate, overstress COEFFICIENT K=2,3 ... is chosen, m, m are the overstress chosen
Coefficient maximum, then experiment surge current peak point current used is set as KIrate；When being shaken according to the closure of specified relay
Between TsSelected surge current pulse width parameter is surge duration t=Ts/ N, N=1,2 ..., n, n are setting value.
3. method as claimed in claim 2, it is characterised in that m=6, n=5.
4. the method as described in claim 1, it is characterised in that when the different surges that the experiment obtains specified relay continue
Between under surge current trouble free service point be：One group of I and t forms a pair of test parameters, and order is applied to the examination on specified relay
Parameters variation is tested, for every a pair of test parameters, carries out relay contact closure, the cyclic test disconnected；In the closure of design
In test number (TN), if contact melted phenomenon does not occur, current test parameter is surge current trouble free service point.
5. the method as described in claim 1, it is characterised in that the combination relay surge current safety curve model, obtain
The special surge current safety curve for taking the specified relay is：From the surge current trouble free service point obtained, choose same
Surge current peak maximum I corresponding to one surge duration tmax, by all (t, the I of selectionmax) it is used as fitting data point；
It is fitted using the relay surge current safety curve model, obtains model parameter, you can obtains specifying relay
Special surge current safety curve.
6. the method as described in claim 1 to 5 any one, it is characterised in that the safety curve model is using electric arc electricity
The exponential curve of stream：kI2t；Wherein, k is for specifying relay model parameter undetermined.
7. method as claimed in claim 4, it is characterised in that the order is applied to the test parameters change on specified relay
For：The generation for realizing surge current pulse is matched using resistance-capacitance network in the load end of relay, passes through regulation resistance, electricity
Capacitance causes surge current peak I and surge duration t to change.
8. method as claimed in claim 7, it is characterised in that the resistance-capacitance network includes current-limiting resistance R0, ballast resistance
R1, load capacitance C and capacitor equivalent series resistance rc；Load capacitance C and capacitor equivalent series resistance rcAfter series connection with ballast resistance
R1Parallel connection, parallel circuit one end connection supply voltage V positive pole, other end series limiting resistor R0With the contact of specified relay
KcSupply voltage V negative pole is connected afterwards；By adjusting current stabilization electricity R1With load capacitance C size, order is applied on specified relay
Test parameters change.
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| CN201710804846.4A CN107703444A (en) | 2017-09-08 | 2017-09-08 | A kind of acquisition methods of magnetic latching relay surge current safety curve |
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Cited By (3)
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| CN109241696A (en) * | 2018-11-16 | 2019-01-18 | 中国空间技术研究院 | A kind of magnetic latching relay choosing method suitable for improving safety |
| CN113552475A (en) * | 2020-04-24 | 2021-10-26 | 贵州振华群英电器有限公司（国营第八九一厂） | Current surge test device |
| CN113985087A (en) * | 2021-10-22 | 2022-01-28 | 宁波公牛电器有限公司 | Switch fusion welding simulation circuit and control method and system thereof |
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Application publication date: 20180216 |